命令行nvidia-smi 查看CUDA

命令行`nvidia-smi`是NVIDIA提供的一个工具，用于管理和监控 NVIDIA GPU 的状态，包括显卡基本信息、GPU温度、占用率、内存使用情况以及当前正在运行的CUDA作业等。通过这个命令，开发者可以实时了解他们的图形处理单元的工作状态，并对CUDA应用的性能有直观的认识。

运行`nvidia-smi`时，你可以看到类似这样的信息：

+-----------------------------------------------------------------------------+
| NVIDIA-SMI 470.104.01    Driver Version: 465.35.00    CUDA Version: 11.4     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  GeForce RTX 3090    Off  | 00000000:04:00.0 Off |                  N/A |
|  80%          38C    P0    |      1MiB / 24179MiB |      0%      Default |
|                               |                      |                  N/A |
+--------+
|   1  GeForce RTX 3090    Off  | 00000000:81:00.0 Off |                  N/A |
|  77%          47C    P0    |      1MiB / 24179MiB |      0%      Default |
|                               |                      |                  N/A |
+--------
 Process name                       | Usage            |
 ------------------------------------+----------------------
 ...                                  | ...              |
 <unnamed> cuda process           | 1MiB / 24179MiB |  2% / 99%
 ...                                  | ...              |
 +-----------------------------------------------------------------------------+
Total memory:       [24179MiB]  Free memory: [24178MiB] | Utilization:     0% /
Memory occupied by running tasks: 1MiB